refactor(bot): replace reminder polling with scheduled dispatches

apps/bot/src/gcp-scheduled-dispatch-scheduler.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, test } from 'bun:test'
+
+import { Temporal } from '@household/domain'
+
+import { createGcpScheduledDispatchScheduler } from './gcp-scheduled-dispatch-scheduler'
+
+describe('createGcpScheduledDispatchScheduler', () => {
+  test('creates Cloud Tasks HTTP tasks for one-shot dispatches', async () => {
+    const requests: Array<{ url: string; init: RequestInit | undefined }> = []
+    const scheduler = createGcpScheduledDispatchScheduler({
+      projectId: 'project-1',
+      location: 'europe-west1',
+      queue: 'dispatches',
+      publicBaseUrl: 'https://bot.example.com',
+      sharedSecret: 'secret-1',
+      auth: {
+        getAccessToken: async () => 'access-token'
+      },
+      fetchImpl: (async (url, init) => {
+        requests.push({
+          url: String(url),
+          init
+        })
+        return new Response(JSON.stringify({ name: 'tasks/dispatch-1' }), {
+          status: 200,
+          headers: {
+            'content-type': 'application/json'
+          }
+        })
+      }) as typeof fetch
+    })
+
+    const result = await scheduler.scheduleOneShotDispatch({
+      dispatchId: 'dispatch-1',
+      dueAt: Temporal.Instant.from('2026-03-24T12:00:00Z')
+    })
+
+    expect(result.providerDispatchId).toBe('tasks/dispatch-1')
+    expect(requests[0]?.url).toBe(
+      'https://cloudtasks.googleapis.com/v2/projects/project-1/locations/europe-west1/queues/dispatches/tasks'
+    )
+    const payload = JSON.parse(String(requests[0]?.init?.body)) as {
+      task: {
+        httpRequest: { url: string; headers: Record<string, string> }
+        scheduleTime: { seconds: string }
+      }
+    }
+    expect(payload.task.httpRequest.url).toBe('https://bot.example.com/jobs/dispatch/dispatch-1')
+    expect(payload.task.httpRequest.headers['x-household-scheduler-secret']).toBe('secret-1')
+    expect(payload.task.scheduleTime.seconds).toBe('1774353600')
+  })
+})